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【求助】 什么是显著性因素，t-检验是什么回事？
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求助。下面是一些材料的弯曲模量，强度、断裂伸长率。数字后面都有个±号，±后面是表示误差范围吗，然后字母ABCDE表示显著性因素，不太懂，请高手指点。 Sample Flexural modulus (GPa) Strength (MPa) Strain at break (%) Izod impact strength (J/m) PP 1.0 ± 0.1A 29.4 ± 2.6A – – PP-SC40 2.2 ± 0.2B 33.3 ± 1.8B 4.5 ± 0.3A 256.2 ± 23.8A PP-SC50 2.6 ± 0.3C 29.9 ± 0.9A 3.3 ± 0.5B 163.4 ± 21.4B PP-SC60 3.0 ± 0.3D 24.9 ± 2.6C 1.9 ± 0.4C 134.8 ± 15.5C PP-SC40-MA 2.6 ± 0.1C 43.2 ± 2.1D 3.3 ± 0.3B 182.0 ± 22.9B,D PP-SC50-MA 3.5 ± 0.2E 49.7 ± 4.0E 2.3 ± 0.3D 175.0 ± 22.0B,D PP-SC60-MA 3.9 ± 0.2F 50.8 ± 1.9E 2.3 ± 0.3D 173.5 ± 22.9B,D PP-KC40 2.5 ± 0.2C 31.7 ± 1.9A,B 3.7 ± 0.8B 191.3 ± 26.2D PP-KC50 2.7 ± 0.2C 32.6 ± 1.4B 3.3 ± 0.4B 182.5 ± 16.4B,D PP-KC60 3.1 ± 0.3D 25.2 ± 2.3C 2.2 ± 0.3C,D 129.6 ± 20.6C PP-KC40-MA 2.9 ± 0.2D 43.2 ± 2.9D 3.1 ± 0.5B 211.0 ± 22.9D PP-KC50-MA 3.4 ± 0.2E 51.6 ± 3.9E 2.5 ± 0.2D 153.2 ± 26.4B PP-KC60-MA 3.3 ± 0.3D,E 47.9 ± 2.9E 2.3 ± 0.3D 182.1 ± 27.2B,D Averages and standard deviations are reported. The superscripts (A–E) denote significant differences between composites for that property determined by a two-tailed t-test at 95% confidence level. [ Last edited by wellok101 on 2008-4-8 at 15:31 ] |
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